Protein. Human IL-37 aa 1-218 is fused at the C-terminus to a His-tag. Source E. coli. Endotoxin content <0.01EU/µg purified protein LAL test Lonza. Lyophilized. Contains PBS. Purity >95% SDS-PAGE. IL-37 IL-1F7 IL-1H4 is an IL-1 family member that is expressed only in certain types of human organs and cells such as heart, thymus, testis, kidney, mononuclear cells PBMCs and dendritic cells. IL-37 is an inhibitor of innate immunity with anti-inflammatory properties. It binds to the interleukin-18 receptor IL-18R and its co-receptor SIGIRR. IL-37 is secreted as a full-length and as a processed form starting from amino acid Val46. It plays an important role as a link between innate and adaptive immunity and acts as an inhibitor of autoimmune diseases and tumor growth. IL-37 also inhibited Lipopolysaccharide LPS-induced immunological reaction and LPS-induced osteoclast formation and bone resorption.